[TCUG] Re: Microsense LED Signal Heads
- From: David B Thompson <DBT@xxxxxxxxxxxxxxxxxxxx>
- To: tcug@xxxxxxxxxxxxx
- Date: Mon, 15 Jul 2002 13:35:00 +0100
===== Original Message from tcug@xxxxxxxxxxxxx at 15/07/02 12:29
>I am experiencing intermittently flashing aspects with Microsense LED Signal
>heads recently installed around the gyratory at J32 on the M4. At 2 nodes in
>particular I have had repeated faults with both red and green aspects.
>However not all the aspects are flashing on a particular phase. For example
>there are 3 RAG heads on a gantry, of which 2 have been observed flashing at
>the same time as a secondary mounted on a 4m pole.
>
>I have had Microsense out and replaced the faulty aspects, but the
>intermittent flashing is still occurring.
>
>Initially I thought it could be down to condensation in the head.
>
>The voltage at this site has been measured up to 260V and Microsense are
>blaming this for causing the fault. I have contacted my electricity supplier
>who have checked the voltage and confirm that they have a fault which will
>be rectified.
>
>I have 2 questions.
>
>* Is anyone else experiencing this problem? When I attended the TCUG
>meeting recently, I raised the issue and Bristol also seemed to have had
>problems although this was put down to a faulty resistor in the head.
>
>* Can anyone confirm what supply tolerance if any LED signal heads are
>tested to.
>
>If it does turn out to be that the voltage is too high but the head meets
>its design criteria, then a word of warning to all. Check supply voltages at
>any site that you intend to use LED heads at, or we need to get the type
>approval tests amended!.
>
>Regards
>
>Dave
>
>
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===== Comments by DBT@JDT-BIRM (David B Thompson) at 15/07/02 13:26
The TSUK data sheet only shows an operating voltage of 230 volts, rather
than an operating range.
It does say that it was tested in accordance with BS-EN12368, but I do not
have a copy of that document handy.
I would have thought that any equipment made for this country would have to
operate within the Electricity supply tolerance of +10 / -6% (253 to 216.2
volts). 260 volts is quite high. I have had problems with CCTV equipment
operating at this voltage.
For information, I believe that the supply tolerances will change to +10 /
-10% from 2003.
jdt
Canterbury House, 85 Newhall Street, Birmingham B3 1LZ
Tel +44(0)121 237 4016; Fax +44(0)121 237 4003
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